added printcommand that simply prints out to the console its arguments
refactored commands help messages, they are now provided through an abstract method, otherwise I'll keep forgetting about the help when adding new ones.
Added version command
added support for fast query string when a string is provided as parameter to search method (all clients)
moved logback.xml from classpath to file system. The one within the classpath is only for testing purpose (test/resources now)
upgraded the exec maven plugin classpath scope to test, so that the logback.xml can be read from test classpath when running the shell from maven for testing
added load command to load external javascript source files
Merge branch 'master' into 0.19